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Funny, I Just did this about a month ago. I had built a new center channel speaker using 2 shieled 6 1/2" Poly cones and a Shieled 1" tweet.
I used a 3rd order low pass filter for the mid-bass and a 3rd order High pass for the tweet. When I first built it I just hand wired it, but what a nightmare, so I went to radio shack and picked up the materials to etch my own board, It looked SOO much nicer (even thought no one but me will ever see it )
Its good to see I'm not the only crazy person here....
For the x-overs design I went to: http://kbapps.com its under the enclosure calculators section.
I used Speaker Workshop (free) from http://audua.com to chart driver impediance and phase. Its a NEAT little program! Also the app was really helpfull during x-over design because I could readily see the results in a chart
I haven't done a freq responce yet (well I did a few in room, but the look like crap) I am getting my hands on a laptop so I can take the enclosure outdoors to a huge parking lot and do freq responce without getting all the reflections included.
Here are the impediance charts for the raw drivers.